CN105546848A - Solar water heater with collector pipe with inner fins with competitively-changed heights - Google Patents

Solar water heater with collector pipe with inner fins with competitively-changed heights Download PDF

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Publication number
CN105546848A
CN105546848A CN201511008812.1A CN201511008812A CN105546848A CN 105546848 A CN105546848 A CN 105546848A CN 201511008812 A CN201511008812 A CN 201511008812A CN 105546848 A CN105546848 A CN 105546848A
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Prior art keywords
tube
thermal
heat
collecting tube
sloping
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Granted
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CN201511008812.1A
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CN105546848B (en
Inventor
赵炜
孙丕波
任佳启
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Changzhou Aohua new energy Co.,Ltd.
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赵炜
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/10Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00Solar heat collectors using working fluids
    • F24S10/90Solar heat collectors using working fluids using internal thermosiphonic circulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/02Tubular elements of cross-section which is non-circular
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00Fins
    • F28F2215/04Assemblies of fins having different features, e.g. with different fin densities
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems

Abstract

The invention provides a solar water heater. The solar water heater comprises a heat collector, and the heat collector comprises a collector pipe, and the collector pipe comprises a flat pipe and ribs; the flat pipe comprises parallel pipe walls and side walls, and the side walls are connected with the ends of the parallel pipe walls; a fluid channel is formed between the side walls and the parallel pipe walls, and the inner fins are arranged on the inner wall of a heat absorption end of the collector pipe; and the heights of the inner fins are continuously decreased at the heat absorption end in the direction from the middle portion of the cross section of the collector pipe to the two sides. According to the solar water heater, the inner fins are changed in the direction from the middle portion of the cross section of the heat absorption end to the two sides, heat absorption can be further strengthened and can be even, and the service life of the collector pipe is prolonged.

Description

A kind of inner rib plate height competitively changes heat-collecting tube solar water heater
Technical field
The invention belongs to field of solar energy, particularly relate to a kind of solar water heater.
Background technology
Along with the high speed development of modern social economy, the demand of the mankind to the energy is increasing.But the traditional energy storage levels such as coal, oil, natural gas constantly reduce, day by day in short supply, cause rising steadily of price, simultaneously the problem of environmental pollution that causes of conventional fossil fuel is also further serious, and these limit the development of society and the raising of human life quality all greatly.One of energy problem's most distinct issues having become contemporary world.Thus seek the new energy, particularly free of contamination clean energy resource has become the focus of present people research.
Solar energy is a kind of inexhaustible clean energy resource, and stock number is huge, and the solar radiant energy total amount that earth surface is received every year is 1 × 10 18kWh, for world's year consumes more than 10,000 times of gross energy.Countries in the world are all using as new energy development important one of the utilization of solar energy, and the Chinese government also clearly proposes to want develop actively new forms of energy at Report on the Work of the Government already, and wherein the utilization of solar energy is especially in occupation of prominent position.But arrive tellurian energy density little (about a kilowatt every square metre) due to solar radiation, and be again discontinuous, this brings certain difficulty to large-scale exploitation.Therefore, in order to extensively utilize solar energy, not only want the problem on technical solution, and must be able to compete mutually with conventional energy resource economically.
Generally, solar water heater adopts thermal-collecting tube to absorb heat, but thermal-collecting tube is because heat transfer problem, the loss of possible heat conduction heat, and because thermal-collecting tube inside arranges fin, causes fluid resistance to rise, thus the problem causing the coefficient of heat transfer low.
In addition, thermal-collecting tube heat absorbing end is in endothermic process, and each position heat exchange amount of heat absorbing end is different, thus causes Local Heat Transfer uneven.
For the problems referred to above, the invention provides a kind of new solar water heater, thus the problem that the coefficient of heat transfer is low and heat exchange is uneven when solving thermal-collecting tube heat absorption.
Summary of the invention
The invention provides a kind of new solar energy system, thus solve the technical problem occurred above.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of solar water heater, comprise water tank, transparency glass plate, thermal insulation layer, absorption film and heat collector, described heat collector comprises thermal-collecting tube, and described thermal-collecting tube comprises heat absorbing end and release end of heat, and described release end of heat is arranged in water tank; Described absorption film is arranged on the one side towards the sun of thermal-collecting tube heat absorbing end, and transparency glass plate covers the heat absorbing end top of thermal-collecting tube, arranges thermal insulation layer between heat absorbing end and transparency glass plate;
Described thermal-collecting tube comprises flat tube and fin, described flat tube comprises tube wall parallel to each other and sidewall, described sidewall connects the end of parallel tube wall, fluid passage is formed between described sidewall and described parallel tube wall, the heat absorbing end inwall of thermal-collecting tube arranges inner rib plate, described inner rib plate is straight tabular, and the bearing of trend of inner rib plate is along heat absorbing end to the direction of release end of heat.
As preferably, along heat absorbing end to the direction of release end of heat, inner rib plate height constantly increases.
As preferably, along heat absorbing end to the direction of release end of heat, the amplitude that inner rib plate height increases is increasing.
As preferably, in heat absorbing end, along the centre of thermal-collecting tube cross section to both sides, the height of described inner rib plate constantly reduces.
As preferably, in heat absorbing end, along the centre of thermal-collecting tube cross section to both sides, the amplitude that the height of described inner rib plate reduces constantly increases.
As preferably, described thermal-collecting tube release end of heat comprises fin, described fin is arranged between tube wall, described fin comprises the sloping portion favouring tube wall, described sloping portion connects with parallel tube wall, described sloping portion is by the multiple passage aisle of spaced for fluid passage formation, and adjacent sloping portion connects on tube wall, forms triangle between described adjacent sloping portion and tube wall; Sloping portion arranges intercommunicating pore, thus makes the adjacent passage aisle intercommunicating pore that communicates with each other be isosceles triangle, the triangle formed between described adjacent sloping portion and tube wall is isosceles triangle;
The drift angle of the isosceles triangle of intercommunicating pore is B, and the drift angle of the isosceles triangle formed between adjacent sloping portion and tube wall is A, then meet following formula:
Sin(B)=a+b*sin(A/2)-c*sin(A/2) 2
Wherein a, b, c are parameters, wherein 0.565<a<0.559,1.645<b<1.753,1.778<c<1.883;
60°<A<160°;35°<B<90°。
9. solar water heater as claimed in claim 8, a=0.5931, b=1.6948, c=1.8432;
80°<A<120°;50°<B<60°。
Compared with prior art, solar water appliance of the present invention has following advantage:
1) the present invention arranges inner rib plate in thermal-collecting tube heat absorbing end inside, and inner rib plate is set to straight tabular and extends to release end of heat direction along heat absorbing end, the flow direction of fluid space and the fluid formed between inner rib plate is consistent, thus minimizing flow resistance, also increase strengthening heat absorption simultaneously.
2) by the height of inner rib plate at the middle part in the change along bearing of trend and the cross section along heat absorbing end to the change of both sides, can make to strengthen heat absorption further, and make heat absorption evenly, extend the life-span of thermal-collecting tube.
3) the present invention by arranging intercommunicating pore on the fin of thermal-collecting tube release end of heat, ensures the connection between adjacent passage aisle, the problem that internal pressure when solving thermal-collecting tube heat exchange is uneven, improves heat exchange efficiency, improve service life.
4) by intercommunicating pore along the area change in flat tube cross-sectional direction, reduction resistance while, improve heat exchange efficiency further.
5) the present invention is by a large amount of experiments, determines the physical dimension of best flat thermal-collecting tube, thus when making to ensure heat exchange resistance, makes heat transfer effect reach best.
Accompanying drawing explanation
Fig. 1 is solar water heater cross section structure schematic diagram of the present invention;
Fig. 2 is thermal-collecting tube cross-sectional structure schematic diagram of the present invention;
Fig. 3 is the cross section structural representation that the present invention's thermal-collecting tube inner rib plate arranges lead to the hole site place;
Fig. 4 is the schematic diagram that the present invention arranges through-hole structure sloping portion plane;
Fig. 5 is another schematic diagram that the present invention arranges through-hole structure sloping portion plane;
Fig. 6 is triangle through hole structural representation of the present invention;
Fig. 7 is the cross sectional representation of thermal-collecting tube heat absorbing part of the present invention;
Fig. 8 is the cross sectional representation of the preferred thermal-collecting tube heat absorbing part of the present invention.
Reference numeral is as follows:
1 thermal-collecting tube, 2 fluid passages, 3 tube walls, 4 sloping portions, 5 summits, 6 intercommunicating pores, 7 fins, 8 water tanks, 9 heat absorbing end, 10 release end of heat, 11 base plates, 12 absorption films, 13 glass plates, 14 thermal insulation layers, 15 inner rib plates.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Herein, if do not have specified otherwise, relate to formula, "/" represents division, "×", " * " represent multiplication.
The present invention relates to a kind of solar water heater, as shown in Figure 1, described solar water heater comprises water tank 8 and heat collector to the structure of described solar water heater, and described heat collector comprises thermal-collecting tube 1, and described thermal-collecting tube 1 is flat hot pipe.Described thermal-collecting tube 1 comprises heat absorbing end 9 and release end of heat 10, and described release end of heat 10 is arranged in water tank 8.Heat absorbing end 9 absorbs solar energy, is transferred heat to the water in water tank by release end of heat 10.
Described solar thermal collector also comprises transparency glass plate 13, thermal insulation layer 14, absorption film 12.Absorption film 12 is arranged on (namely towards the one side of the sun) above thermal-collecting tube 1 heat absorbing end 9, and transparency glass plate 13 covers the front of the heat absorbing end 9 of thermal-collecting tube, leaves thermal insulation layer 17 between heat absorbing end 9 and transparency glass plate 16, and as preferably, thermal insulation layer is vacuum layer.Safety glass, thermal insulation layer is adopted to be vacuum layer as preferably clear glass plate 16; As preferably, absorption film 12 is arranged on the front of heat pipe 1 heat absorbing end 9 by the mode of sputtering.
Base plate 11 is arranged on thermal-collecting tube 1 bottom, and described base plate is insulation material.
As preferably, the thickness of thermal insulation layer 17 is 18mm ~ 25mm; As being preferably 20mm.
As shown in Figure 2, at release end of heat 10, described thermal-collecting tube comprises flat tube 1 and fin 7, described flat tube 1 comprises tube wall 3 parallel to each other and sidewall 12, described sidewall 12 connects the end of parallel tube wall 2, fluid passage 2 is formed between described sidewall 12 and described parallel tube wall 3, described fin 7 is arranged between tube wall 3, described fin 7 comprises the sloping portion 4 favouring tube wall, described sloping portion 4 connects with parallel tube wall 3, described sloping portion 4 is by multiple for spaced for fluid passage 2 formation passage aisle 10, adjacent sloping portion 4 connects on tube wall, triangle is formed between described adjacent sloping portion 4 and tube wall 3, sloping portion 4 arranges intercommunicating pore 6, thus adjacent passage aisle 10 is communicated with each other.
By arranging intercommunicating pore 6, ensure the connection between adjacent passage aisle 10, thus the fluid in the passage aisle making pressure large can flow in the passage aisle little to contiguous pressure, solve the problem that internal pressure is uneven and local pressure is excessive when flat tube heat exchange, thus facilitate the abundant flowing of fluid in heat exchanger channels, improve heat exchange efficiency, also improve the service life of thermal-collecting tube simultaneously.
As preferably, along the centre centre position of tube wall 3 (namely in Fig. 2 cross sectional representation) of the tube wall 3 of flat tube cross section, to both sides sidewall 12 direction, described through hole 6 area on different sloping portion 4 constantly diminishes.Wherein, be positioned at the centre position of flat tube 1, i.e. the centre position of tube wall 3 in Fig. 2 cross sectional representation, the area of through hole 6 is maximum.Main cause found through experiments, because fluid maldistribution, intermediate pressure is maximum, reduces gradually from centre to pressure at both sides.Therefore the distribution of via area, the fluid at middle part is flowed to both sides as far as possible, reduce the flow resistance at middle part, cause the minimizing of heat exchange area in order to avoid perforated area is excessive simultaneously, perforated area is changed according to pressure, while reduction resistance, improve heat exchange efficiency further.
As preferably, along the centre of flat tube cross section to sidewall 12 direction, the amplitude that described through hole 6 area on different sloping portion 4 constantly diminishes is increasing.By setting like this, be also the Changing Pattern meeting flowing pressure, while reducing flow resistance further, improve heat exchange efficiency.
As preferably, the shape of described intercommunicating pore 6 is isosceles triangle, and the mid point on the base of described isosceles triangle is identical with the flow direction of fluid to the direction of drift angle.That is, the drift angle direction of isosceles triangle is fluid flow direction.Found through experiments, drift angle direction is set to be consistent with flow direction, can heat exchange efficiency be improved, reduce flow resistance simultaneously.By setting like this, the heat exchange efficiency of about 10% can be improved, reduce the resistance of about 9% simultaneously.
As preferably, forming triangle between described adjacent sloping portion and tube wall is isosceles triangle, is called for short the second isosceles triangle later.By being set to isosceles triangle, fluid flowing can being ensured evenly, improving heat transfer effect.
As preferably, described sloping portion summit 5 is plane, and the summit 5 of described two adjacent sloping portions 4 is connected, and described summit 5 is connected with tube wall 3.Because arrange fixed point 5 for plane, therefore make sloping portion 4 large with tube wall contact area, thus tube wall and sloping portion are more fully better contacted.Installation is more prone to, avoids sliding.
As preferably, form in triangle between adjacent sloping portion 4 and tube wall, the tie point of the inner surface that sloping portion 4 is relative forms vertex of a triangle, and described vertex of a triangle is positioned on tube wall.
As shown in Figure 6, the drift angle of described isosceles triangle is B, and as Fig. 4, shown in 5, along the flow direction of fluid, same sloping portion 4 arranges many row's triangle through hole 6.As shown in Figure 5, many exhausting holes 6 are shifted structure.
Find in an experiment, the area of through hole can not be excessive, excessive words can cause the loss of heat exchange area, reduce heat exchange efficiency, too small, cause local pressure to distribute still uneven, in like manner, the distance of adjacent tube wall 3 can not be excessive, and cross the reduction that conference causes heat exchange efficiency, too small meeting causes flow resistance excessive.Experimentally find, the drift angle of the first isosceles triangle and the drift angle of the second isosceles triangle are the change of certain rule, such as the second isosceles triangle drift angle becomes large, thus cause the passage aisle area of heat exchanger channels to increase, corresponding flow resistance diminishes, and therefore now the circulation area of the second isosceles triangle will diminish, and can reduce the area of through hole 6 like this, when ensureing flow resistance, improve heat exchange efficiency simultaneously.Therefore there is following relation between the first isosceles triangle and the second isosceles triangle drift angle:
The drift angle of the first isosceles triangle is B, and the drift angle of the second isosceles triangle is A, then meet following formula:
Sin(B)=a+b*sin(A/2)-c*sin(A/2) 2
Wherein a, b, c are parameters, wherein 0.565<a<0.559,1.645<b<1.753,1.778<c<1.883;
60°<A<160°;35°<B<90°。
As preferably, a=0.5931, b=1.6948, c=1.8432;
80°<A<120°;50°<B<60°;
By above-mentioned formula, the best relation between the first isosceles triangle and the second isosceles triangle drift angle can being determined, can ensureing when meeting flow resistance under this relation, reach best heat exchange efficiency.
As preferably, H=7-18mm.Be further used as preferably, 10<H<11mm.
As preferably, the length on the first isosceles triangle base is h, meets following formula:
0.28<d*(h/H) <0.36; Wherein d is parameter, 0.7<d<2.0;
H be with the relative face of adjacent tube wall between distance.
As preferably, 1.0<d<1.4.
As preferably, along with drift angle is the increase of A, described d diminishes.
As preferably, along with the increase of H, described d diminishes.
The width of tube wall is W, is preferably 7.4>W/H>4.6, further preferably, and 6.8>W/H>5.6.
One by above-mentioned optimal design, can improve the heat exchange property of thermal-collecting tube further, reduce flow resistance simultaneously.
For the situation that the drift angle A of sloping portion formation is different, such as along the middle part of tube wall to the sidewall direction of both sides, the situation that the included angle A that described adjacent sloping portion is formed is more and more less, the mean value of two drift angles that the A in formula above takes sloping portion adjacent calculates.
The present invention is thousands of numerical simulations by the thermal-collecting tube of multiple different size and test data, meeting in industrial requirements pressure-bearing situation (below 10MPa), when realizing maximum heat exchange amount, the dimensionally-optimised relation of the flat tube tube wall of the best summed up.
As preferably, the base of the adjacent isosceles triangle through hole of described same row all on one wire, the through hole distance that same row is adjacent is S1, described 2.9 × h<S1<3.3 × h, wherein S1 is with the distance of the mid point on the base of adjacent two isosceles triangle through holes.Be preferably 3.2 × h=S1.
As preferably, the base of the isosceles triangle of the through hole of adjacent row is parallel to each other, and the summit of isosceles triangle is L to the distance of base mid point, and the distance S2 of adjacent row is 3.8*L<S2<4.8*L.Be preferably S2=4.4*L
When the base of the isosceles triangle of adjacent row is different, take the weighted average on two bases to calculate.
As preferably, the angle of the isosceles triangle of same row is identical with base.Namely shape is identical, is equal shape.
For formula above, for the through hole that front and rear row size is different, be also still suitable for.
As preferably, the wall thickness of fin is 0.5-0.9mm; As preferably, 0.6-0.7mm.
For the concrete dimensional parameters do not mentioned, design according to normal heat exchanger.
Described fin 7 is only arranged on release end of heat 10.
As preferably, as Fig. 7, shown in 8, heat absorbing end 9 inwall of thermal-collecting tube 1 arranges inner rib plate 15.
As preferably, described inner rib plate 15 is straight tabular, the bearing of trend of inner rib plate 15 along fluid evaporator flow direction, namely along heat absorbing end 9 to release end of heat direction, moving axially in other words along thermal-collecting tube heat absorbing end 9.By setting like this, the flow direction of fluid space and the fluid formed between inner rib plate is consistent, thus reduces flow resistance, also increase strengthening heat absorption simultaneously.
As preferably, along heat absorbing end 9 to release end of heat direction, inner rib plate 15 highly constantly increases, and the amplitude highly increased is increasing.By increasing inner rib plate 15 height, thus increase the heat exchange area of inner rib plate 15.Experiment finds, by setting like this, compared with identical with fin height, can improve the heat exchange efficiency of about 7%.
As preferably, as shown in Figure 7, along the centre of thermal-collecting tube 1 heat absorbing end 10 cross section to both sides, the height of described inner rib plate 15 constantly reduces.Wherein, be positioned at the centre position of thermal-collecting tube 1 heat absorbing end 10, the height of inner rib plate 15 is the highest.
Because found by test, thermal-collecting tube heat absorbing end in middle part heat absorption at most, from middle part to both sides, heat absorption diminishes gradually, therefore by arranging inner rib plate 15 height change of thermal-collecting tube, make the endotherm area of thermal-collecting tube heat absorbing end maximum at middle part like this, minimum in both sides, make middle part heat absorption capacity maximum, meet the heat absorption rule of thermal-collecting tube heat absorbing end heat like this, make thermal-collecting tube heat absorbing end heat absorption on the whole evenly, avoid thermal-collecting tube heat absorbing end local temperature overheated, cause radiating effect excessively poor, cause the shortening in thermal-collecting tube heat absorbing end life-span.
By above-mentioned setting, middle part flow resistance can be made to become large, and more fluid distributes to heat absorbing end both sides, fluid is distributed more even.
As preferably, from centre to both sides, the amplitude that the height of described inner rib plate 15 reduces constantly increases.
By above-mentioned setting, be also the heat absorption rule meeting thermal-collecting tube heat absorbing end, improve the heat absorption efficiency of thermal-collecting tube heat absorbing end further, ensure the entirety heat absorption of thermal-collecting tube heat absorbing end evenly, homogeneous temperature, increases the life-span of thermal-collecting tube.
As preferably, described thermal-collecting tube is gravity assisted heat pipe.
Although the present invention discloses as above with preferred embodiment, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.

Claims (5)

1. a solar water heater, comprises water tank, transparency glass plate, thermal insulation layer, absorption film and heat collector, and described heat collector comprises thermal-collecting tube, and described thermal-collecting tube comprises heat absorbing end and release end of heat, and described release end of heat is arranged in water tank; Described absorption film is arranged on the one side towards the sun of thermal-collecting tube heat absorbing end, and transparency glass plate covers the heat absorbing end top of thermal-collecting tube, arranges thermal insulation layer between heat absorbing end and transparency glass plate;
It is characterized in that, described thermal-collecting tube comprises flat tube and fin, described flat tube comprises tube wall parallel to each other and sidewall, described sidewall connects the end of parallel tube wall, fluid passage is formed between described sidewall and described parallel tube wall, the heat absorbing end inwall of thermal-collecting tube arranges inner rib plate, and described inner rib plate is straight tabular, and the bearing of trend of inner rib plate is along heat absorbing end to the direction of release end of heat.
2. solar water heater as claimed in claim 1, in heat absorbing end, along the centre of thermal-collecting tube cross section to both sides, the height of described inner rib plate constantly reduces.
3. solar water heater as claimed in claim 2, in heat absorbing end, along the centre of thermal-collecting tube cross section to both sides, the amplitude that the height of described inner rib plate reduces constantly increases.
4. solar water heater as claimed in claim 1, described thermal-collecting tube release end of heat comprises fin, described fin is arranged between tube wall, described fin comprises the sloping portion favouring tube wall, described sloping portion connects with parallel tube wall, described sloping portion is by the multiple passage aisle of spaced for fluid passage formation, and adjacent sloping portion connects on tube wall, forms triangle between described adjacent sloping portion and tube wall; Sloping portion arranges intercommunicating pore, thus makes the adjacent passage aisle intercommunicating pore that communicates with each other be isosceles triangle, the triangle formed between described adjacent sloping portion and tube wall is isosceles triangle;
The drift angle of the isosceles triangle of intercommunicating pore is B, and the drift angle of the isosceles triangle formed between adjacent sloping portion and tube wall is A, then meet following formula:
Sin(B)=a+b*sin(A/2)-c*sin(A/2) 2
Wherein a, b, c are parameters, wherein 0.565<a<0.559,1.645<b<1.753,1.778<c<1.883;
60°<A<160°;35°<B<90°。
5. solar water heater as claimed in claim 4, a=0.5931, b=1.6948, c=1.8432;
80°<A<120°;50°<B<60°。
CN201511008812.1A 2015-12-30 2015-12-30 Solar water heater with collector pipe with inner fins with competitively-changed heights Active CN105546848B (en)

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Publication number Priority date Publication date Assignee Title
CN109668331A (en) * 2018-07-07 2019-04-23 青岛鑫众合贸易有限公司 A kind of solar water heater of evaporation ends equalizer flow tube caliber change
CN109668330A (en) * 2018-07-07 2019-04-23 青岛鑫众合贸易有限公司 A kind of solar water heater of condensation end equalizer flow tube caliber change
CN109668330B (en) * 2018-07-07 2020-04-14 青岛鑫众合贸易有限公司 Solar water heater with variable pipe diameter of condensation end flow equalizing pipe
CN109668331B (en) * 2018-07-07 2020-05-12 青岛鑫众合贸易有限公司 Solar water heater for heating liquid medicine

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Address after: 210000 elegant building, No.91 Jiangdong North Road, Gulou District, Nanjing, Jiangsu Province

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